Setting a custom field as required is only available on the Ultimate plan.
When creating custom fields, certain types of custom fields can be set as required. Those include:
budgets
bookings
deals
companies
To set a custom field as required, head over to Settings - Custom fields:
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Select the custom field you wish to update or create a new one:
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Tick the option "Set as a required field":
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Now if you try and create a new deal without the required custom field entered, an error will appear: